One of the regulating services provided by the ecosystem is pollination. Option B.
What are ecosystem services?Ecosystem services are natural processes that are maintained by the ecosystem but which benefit man and mankind.
There are different types of services offered by the ecosystem and that benefit man immensely. These are:
Provisional services: which include food, raw materials, drugs, and so on.Regulating services: including the regulation of important processes such as pollination, decomposition, carbon storage, etc.Cultural service: non-material benefits that man derives from the ecosystem. Such as recreation, music, etc. Supporting services: such as water cycle, nutrient cycle, etc.The ecosystem plays a regulatory role in the pollination of plants for the benefit of mankind. Wind helps to carry pollens from the anther to the stigma of flowers. By doing so, fruits, vegetables, seeds, etc, become available for the use of man.
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Sodium can combine with element "X" so that
the chemical formula is Na₂X. What element
could element "X" be?
A)Phosphorus
B)Helium
C)Magnesium
D)Sulfur
The element could be X is phosporus .
What is element?
An element is the fundamental item that can't be easily broken onto smaller of pieces. In chemistry and physics, an elementary is a substance that can't be broken down by non-nuclear reactions. In computing and the mathematics, an element is the distinct piece of a larger system or set.
Sol-An ionic compound is formed by the ions, which their charges replaced, so the compound Na₂X is formed by the ions Na⁺ and X⁻². Thus, X must gain two electrons to be stable at the octet, so it has 6 valence electrons. Because it can accommodate up to 12 electrons, the elememts expands the octet, do it must be in the 3rd period or higher.
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When a chlorine atom reacts weith a sodium atom to form an ion, the chlorine atom will
Select one:
a.
gain one electron
b.
gain two electons
c.
lose two electrons
d.
lose one electon
Answer:
each chlorine atom will lose one electron
14.what volume, in milliliters, of 6.0 m naoh is needed to prepare 175 ml of 0.20 m naoh by dilution?
5.83ml of NaOH is needed to prepare 175 ml of 0.20 m by dilution.
Dilution is the process of “lowering the concentration of a solute in a solution by simply adding more solvent to the solution, such as water.” Diluting a solution enables adding more solvent without adding more solute.
into formula to find out the volume is ;
[tex]V_{1}[/tex][tex]N_{1}[/tex] = [tex]V_{2}N_{2}[/tex]
where [tex]V_{1}[/tex]= ?
[tex]V_{2}[/tex] = 175ml
[tex]N_{1}[/tex] = 6
[tex]N_{2}[/tex] = 0.2
So, ⇒ [tex]V_{1}[/tex]×6 = 175×0.2
[tex]V_{1}[/tex] = 5.83 ml
So, 5.83ml of NaOH is needed to prepare 175 ml of 0.20 m by dilution.
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the difference in the atomic radii of fluorine and lithium is most similar to the difference in the atomic radii of which pair of elements?
As one proceeds through the periodic table from left to right, the atom of each element gets smaller. Lithium's higher atomic radius than that of fluorine is most comparable.
What is meant by atomic radii?Atomic radius, also known as atomic radius, is the total length between an atom's nucleus and its electron's outer orbital. The average or normal distance between the nucleus's center and the edge of the surrounding electron shells is what we refer to as an element's ionic radii.
Why do atomic radii occur?This is due to the fact that there are higher energy levels, resulting in a wider gap between electrons and protons. The attraction between the remaining electrons and the positive charges nucleus is also reduced as a result of electron shielding, allowing them to move further away from it. As a result, the size and atomic radius grows.
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the absorbance and fluorescence of a molecule are shown on a spectrum. what can be concluded about the features of the spectrum?
According to the given condition, the
absorbance
is the signal at the highest energy, or longest wavelength. The
fluorescence
is the signal at the lowest energy, or shortest wavelength.
Absorbance is the
logarithm
of the ratio of incident to transmitted radiant power through a sample. It is also known as the measure of the capacity of a substance to absorb light in a specific wavelength.
Fluorescence is the
emission
of light by a substance that has absorbed light or other electromagnetic radiation. Fluorophores are molecules that absorb light in a specific wavelength and emit light in another wavelength.
Absorbance is measured by the principle of
Beer-Lambert's
law. It is also known as Beer's law. It states that the attenuation of light to the properties of the material through which the light is travelling. It is commonly used in chemical analysis and measurements of physical optics for photons and neutrons.
In comparison with absorbance and fluorescence, it is important to consider the specificity of each method. In absorbance, a light of certain wavelength is passed through the solution to measure the optical density or concentration.
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2. after work-up, the product of the wittig reaction was recrystallized from hot isopropanol. you were told to do a gravity filtration using a heated stemless funnel if the solution appeared cloudy. what was the likely identity of compound that caused the cloudiness? it was also indicated that the filter should be washed with hot isopropanol if crystals started to form on the stemless funnel. why would hot isopropanol be used instead of cold isopropanol
The molecules of isopropyl alcohol do not stick collectively as strongly at room temperature as water molecules do, because of this the alcohol evaporates more quickly than water does.
DNA isn't soluble in ethanol, consequently, it will clump collectively and come to be visible. The colder the ethanol, the less soluble the DNA can be in it, which is why it's far critical for the ethanol to be kept bloodless.
Isopropyl Alcohol may also shape an ignitable vapor/air combination in closed tanks or boxes. Isopropyl Alcohol can react with AIR and OXYGEN over the years to shape unstable peroxides which can explode. Isopropyl Alcohol forms explosive combos, whilst heated, with ALUMINUM.
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Marie mixed 5 g of carbon with 5 g of lead oxide.
She heated the mixture strongly for 15 minutes in a fume cupboard.
After 15 minutes, Marie found some shiny beads in the mixture.
a.
i) Marie collected all the shiny beads from this experiment.
How could she test them to show they were metal?
_________________________________________________________
_________________________________________________________
ii) Marie’s test showed that the tiny beads were metal.
What metal were the beads likely to be?
________________________________________________________
b. Marie also expected carbon dioxide to be formed in this experiment.
i) In carbon dioxide, what element is combined with carbon?
__________________
ii) Where, apart from the air, did this element come from in this experiment?
__________________
c. Give one safety precaution Marie should take during this experiment.
1. Marie could test if the beads she collected were metals by seeing if they conducted electricity or by adding it to a dilute acid to see if hydrogen gas is evolved.
2. Since the reaction involved a metallic oxide, lead oxide, the metal would most probably be Lead.
3. The element that is combined with carbon in carbon dioxide is oxygen.
4. The element oxygen in this experiment comes from lead oxide.
5. Marie should wear goggles as a piece of safety equipment in this experiment.
What are some properties of metals?Metals are shiny hard substances that form positive ions by the loss o electrons.
Some properties of metals include;
high densityability to conduct heat and electricitymalleable and ductileproduces sound when struckLead is an example of metal whereas lead oxide is a compound of lead and oxygen.
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* i need to make a 2.00 m solution of sodium hydroxide. i have a 11.9 m solution of naoh on the shelf. how many ml of the 11.9 m solution of naoh do i need to make 2 liters of the 2.00 m naoh solution?
336 ml of the 11.9 m solution of NaOH do i need to make 2 liters of the 2.00 m NaOH solution
What is Chemical reaction ?
Chemical reactions happen absolutely everywhere. While we sometimes associate chemical reactions with the sterile environment of test tubes and laboratories, nothing is farther from the truth. In fact, a vast number of transformations are creating a dizzying and almost incomprehensible series of new matter and energy changes in our world every second of every day. In nature, chemical reactions can be much more difficult to control and in some cases much more complex than in the laboratory, and generally occur whether you want it or not!In the woods A raging fire, the slow rusting process of iron over the years in the presence of oxygen and water, or the delicate ripening of fruit on a tree, the transformation of various chemicals, etc... (reactants ) into another group of substances (products) is a so-called chemical reaction.
use M1V1=M2V2
V1 = M2V2/M1 = 336 ml .
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when energy-depleted elements associated with a proton are accepted by an organic molecule, the process is called
When energy depleted elements associated with a proton are accepted by an organic molecule the process is called Fermentation.
Fermentation is a metabolic process that causes a chemical change inside body by the actions of enzymes.
The main purpose of fermentation is to generate NAD+ and 32 ATP in the presence of oxygen.
Fermentation allows cells to survive without using ATP.
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Without stratospheric ozone (o3), harmful solar radiation would cause gene alterations. ozone forms when the bond in o2 breaks and each o atom reacts with another o2 molecule. it is destroyed by reaction with cl atoms formed when the c―cl bond in synthetic chemicals breaks. find the wavelengths of light that can break the c―cl bond and the bond in o2. give your answers in scientific notation.
The wavelengths of light that can break the Cl-Cl bond and the bond in O₂ will be λ = 3.53 × 10⁻⁷ m and λ =2.4 × 10⁻⁷ m respectively.
Cl-Cl- Bond energy (E)= 339 KJ/mol
O=O Bond energy (E)= 498 KJ/mol
h = 6.626 × 10⁻³⁴ J.s
c = 3 × 10⁸ m/s
N = 6.02214076 × 10²³
For Cl-Cl bond
We will use the following formulae
λ = Nhc/E (for one mol photons)
Put the values
λ = [(6.02214076 × 10²³ p/mol)(6.626 × 10⁻³⁴ J.s)(3 × 10⁸ m/s) / (339 × 10³ J/mol)] × 1 nm / 10⁻⁹ m
λ = 353 nm
λ = 3.53 × 10⁻⁷ m
For O=O bond
We will use the following formulae
λ = Nhc/E (for one mol photons)
Put the values
λ = [(6.02214076 × 10²³ p/mol)(6.626 × 10⁻³⁴ J.s)(3 × 10⁸ m/s) / (498 × 10³ J/mol)] × 1 nm / 10⁻⁹ m
λ = 240 nm
λ = 2.40 × 10⁻⁷ m
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the salad is physical or chemichal change
Answer:
physical change
Explanation:
bcoz we make salad with raw vegetables and fruits
The salad is a physical change.
Making a fruit salad with raw fruits is a physical change because in this process chemical composition of fruits is not changed.
Telling the difference between a chemical change and a physical change seems trickier than it is. The main difference between a chemical change and a physical change is what happens to a substance’s composition. Here are the basic definitions of chemical and physical changes:
chemical change – a process in which chemical bonds are broken or created to make a new substance
physical change – a process in which a substance changes its state of matter, but chemical bonds stay intact
When matter undergoes a chemical change, it can’t return to its original state without additional reactions. But when it undergoes a physical change, it only needs to return to its original state of matter. The molecules of the substance haven’t been changed at all.
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For a certain farming community in California, a water shortage is predicted if the average global temperature rises by 1 degree Celsius. The residents of this community rely on private vehicles powered by fuels for transportation because there is no public transportation system. Farm vehicles powered by diesel fuel are used to harvest crops and get them to market. Residents of the farming community want to reduce their impact on global temperature increases by reducing their carbon dioxide emissions. Residents of the farming community want to reduce their impact on global temperature increases by reducing their carbon dioxide emissions.
Choose the answers below that are true in regards to this scenario.
Question 2 options:
Residents of this community drive personal fuel-powered vehicles.
Farmers in this community use diesel-powered farm vehicles.
Residents in this community are NOT concerned about reducing their CO2 emissions.
The answers that are true in regards to the scenario above is:
Residents of this community drive personal fuel-powered vehicles.Farmers in this community use diesel-powered farm vehicles.So, the first and second options are correct. The third and last option is incorrect.
What is a community?A community is described as a social unit with commonality such as place, norms, religion, values, customs, or identity.
From the scenario above, we can conclude the following:
residents of the farming community want to reduce their impact on global temperature increases by reducing their carbon dioxide emissions. Residents of this community drive personal fuel-powered vehicles.Farmers in this community use diesel-powered farm vehicles.Learn more about vehicles at: https://brainly.com/question/26006107
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which one is correct?
molar mass of Mg(OH)2 in g/mol
Answer:
2× Ar(O) + Ar(H) ×2 =58,3197 g/mol
why is it that carbon dioxide from carbonated beverages, pets, cattle, farm animals, and humans, yeast, dry ice, fireplaces, charcoal grills, campfires, wildfires, alcohol and ethanol is ok, and carbon dioxide from fossil fuel is bad?
The amount of carbon dioxide (CO2) released when burning fossil fuels is the primary factor in why fossil fuels are so destructive. The greenhouse effect and climate change are significantly impacted by the burning and release of CO2. Our planet warms because more CO2 in the atmosphere prevents sunlight from escaping back into space.
what are fossils?
A fossil is any preserved remnants, impression, or trace of any once-living organism from a previous geological epoch (from Classical Latin: fossilis, meaning "obtained by digging"). Bones, shells, exoskeletons, animal or microbe impressions in stone, items preserved in amber, hair, petrified wood, oil, coal, and DNA traces are a few examples.
The earth's natural mechanisms have controlled greenhouse gas output for millions of years. At a pretty constant rate, gases would be absorbed and released. Meanwhile, temperatures were kept at a level that allowed for the continuation of life on Earth. This is "a balancing act," according to the Environmental Protection Agency.As the Industrial Revolution got under way in the second part of the 1700s, humans began to alter the delicate balance. Since then, we have been continuously increasing the amount of greenhouse gases, particularly CO2, that are being injected into the atmosphere. These gases trap heat and cause global warming. Despite the fact that there are many greenhouse gases, some of which are more powerful than others, CO2 currently accounts for about 84 percent of all greenhouse gases produced by human activity, or about 30 billion tonnes annually.Although forestry and industrial operations also make significant contributions, the majority of this is caused by burning fossil fuels for transportation and power.
CO2 levels were at 270 parts per million before the Industrial Revolution (ppm). In 1960, CO2 concentrations were at 313 ppm.
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which of the following element pairs would be most likely to form an ionic compound? a) hydrogen; carbon b) nitrogen; oxygen c) oxygen; carbon d) calcium; carbon e) sodium; potassium
Among the above given element pairs none of them are likely to form ionic compounds
Ionic bonds are basically the electrostatic attractions formed between oppositely charged ions in an ionic compound. Generally ionic bonds are often formed when electrons are transferred from metal atom to a non metal atom.
We can say that ionic bond is most likely formed between metal and nonmetal elements .
In the above given electron pairs none of the pairs given are likely to form ionic compounds as none of the pair is of a metal and a nonmetal. An element can be classified as a metal if its found on the left side of the periodic table while non metals are located on the right of the periodic table.
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what is the ph of a solution obtained by dissolving two extra-strength aspirin tablets, containing 450 mg of acetylsalicylic acid each, in 300 ml of water?
The ph of a solution obtained by dissolving two extra-strength aspirin tablets is 8.
The Concentration of solution is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.
Calculation:-
volume = 300 ml = 0.3 L
mass = 450 mg
molar mass C₉H₈O₄ = 180
mole = mass / molar mass
= 450/180
= 2.5 mol
Concentration = mole/volume
= 2.5 /0.3
= 8.33
PH = - llog[H+]
= 8.
The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of answer.
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you do a calculation on a molecule and determined that the energy of the highest occupied molecular orbital (homo) is -2.42 hartree, and the energy of the lowest unoccupied molecular orbital (lumo) is 0.65 hartree. what is the wavelength of the photon required to excite this molecule from its ground state, to its first excited state?
The wavelength of the photon required to excite this molecule from its ground state, to its first excited state is 1240 nm.
This is given by the equation:
wavelength = hc/(E_homo - E_lumo)
where h is Planck's constant =6.626070 * 10^-34 J.m , c is the speed of light = 3.0 x 10^8 m/s^2, and E_homo and E_lumo are the energies of the highest occupied molecular orbital and the lowest unoccupied molecular orbital, respectively.
In this particular case, the wavelength of the required photon would be:
wavelength = hc/(-2.42 hartree - 0.65 hartree)
= 6.626070 * 10^-34 X 3.0 x 10^8 / (-3.07)
= 1240 nm
Hence , The wavelength of the photon required to excite this molecule from its ground state, to its first excited state is 1240 nm.
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What is the wavelength of a radio wave having a frequency of 3.75 x 10^7 Hz?
The wavelength of a radio wave having a frequency is 0.8m.
Radio waves are the longest waves in the electromagnetic spectrum. These waves are a form of electromagnetic radiation with frequencies ranging from 300 GHz to 3 kHz, but above 3 GHz are defined as microwaves. Wave frequency is the number of waves passing through a fixed point in a given time.
calculation:-
frequency = 3.75 x 10^7 Hz?
f = wavelength / speed of light
wavelength = c/f
= 3 × 10^8 / 3.75 x 10^7 Hz
= 0.8 m.
Frequency is the rate at which the current changes direction per second. It is measured in hertz an international unit of measurement where one hertz equals one cycle per second. To calculate the frequency of a wave, divide the velocity of the wave by the wavelength. Write your answer in Hertz or Hz which is the unit for frequency. If you need to calculate the frequency from the time it takes to complete a wave cycle or T the frequency will be the inverse of the time or 1 divided by T.
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An experiment was carried out to find
out how the mass of potato chips
changed when they were left in sugar
solutions of different strengths. The
table of results is shown below. Would
you expect the value of X to be more or
less than 2.5g?
Answer:
the answer would be more than 2.5g
Explanation:
how many grams of koh is required to produce 800 ml of 0.500 m naoh solution? enter the number only, not units
For every 800 ml of 0.500 m potassium oxide solution, one gramme of potassium hydroxide is needed.
The following knowledge is necessary to answer the question:
KOH has a molar mass of 56u.
Molarity is defined as Mass of Solute multiplied by 1000 or (Molar mass of Solute divided by mL of Solution).
Given are the values M=0.4 and V=800mL.
The formula yields the following result: 0.5 = Mass of KOH 1000/(56 800).
When it is solved, 8 grammes of KOH are required.
Molar mass simple: What is it?The molar mass of a substance is the weight of one mole of that substance, how many grammes are contained in one mole of a specific chemical is what is meant by the term "molar mass." The atomic masses used to calculate the molar mass are given in the periodic table.
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write the net ionic equation for the reaction between agno3aq and na2so4aq. be sure to include states of matter in your answer.
The net ionic equation for the reaction between agno3aq and na2so4aq would be 2Ag+(aq) + SO4^2-(aq) → Ag2SO4(s)
The net ionic equation shows the chemical species involve in the chemical reaction while the complete ionic equation also involves the spectator ions. The net ionic equation state whether precipitation occurs or not. If the chemical reaction has no net ionic equation it means all are aqueous from no precipitation occurring.
AgNO3 → Ag+ + NO3-
Na2SO4 → 2Na+ + SO4^2-
2AgNO3(aq) + Na2SO4(aq) → 2Ag+(aq) + 2NO3-(aq) + 2Na+(aq) +SO4^2-(aq)
2Ag+(aq) + 2NO3-(aq) + 2Na+(aq) +SO4^2-(aq) → Ag2SO4(s) + 2NaNO3(aq)
2AgNO3(aq) + Na2SO4(aq) → Ag2SO4(s) + 2NaNO3(aq)
We cancel the spectator ions (NO3^- and Na^+)
the net ionic equation with states of matter is:
2Ag+(aq) + SO4^2-(aq) → Ag2SO4(s)
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hat is the chemical symbol for magnesium?
Mo
Mn
Mg
Md
Answer:
The chemical symbol for Magnesium is Mg
Explanation:
As you can see on the periodic table Magnesium is in group two and has the element symbol of Mg
Hope this helps, have a great day!
Which of the following ions is a polyatomic ion?
OP³-
OOH
0²-
Mg
Polyatomic ion is OOH
Polyatomic ion are ion which consist of more than one atom and atom in a polyatomic ion are usually covalently bonded to one another and therefore stay together as a single or charged unit and here OOH there are two oxygen atom and one hydrogen atom that's it is polyatomic ion
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which of the following pairs of compounds could be separated by chemically active extraction? what reagents would you use? a. ch3ch2co2h and clch2ch2co2h b. phenol and alcohol c. nh and o
Option-(b) Phenol and alcohol could be separated by chemically active extraction.
In the chemically active extraction ,the compounds are treated with an acid or a base to alter their chemical structure. There are 3 types of chemical extraction. liquid-liquid, liquid-solid and acid base extraction. Acid-base extraction is known as a chemically active extraction.
A phenol is a weak acid.it can lose hydrogen ion when dissolved in water. alcohol is both acid and a base.it reacts with a strong base. The Oxygen atom makes alcohol a base. phenol and alcohol treated with DNA in the process of active extraction.
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what mass, in grams, of cacl2 is required to prepare exactly 500 ml of a 0.24000000000000002 m solution of cacl2?
11.10 moles of cacl2 are required
Lets 0.24000000000000002m approx. be 0.2m
so, Molarity = 0.2m
volume = 500 ml
we know that
molarity = no. of moles of solute (cacl2) / volume of solutions
0.2m = n / 0.5 L
n = 0.1 moles of cacl2
now,
1 mole of cacl2 = 110.98 gm
so,
o.1 moles of cacl2 = 11.10 gm
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where was oxygen discovered?
Answer: nowhere from trees
Explanation:
How many moles of H₂ do you need to produce 8 moles of NH3 if you have plenty of N₂? SHOW ALL WORK FOR THIS CALCULATION.
12 moles of H₂ need to produce 8 moles of NH3 if you have plenty of N₂ .
What is a chemical reaction ?
Chemical reaction, the process by which one or more substances (reactants) are transformed into one or more other substances (products). Substances are either chemical elements or compounds. Chemical reactions rearrange the constituent atoms of reactants to produce different substances as products.
Chemical reactions are part of technology, culture, life . Fuel combustion, glass and pottery making, beer , and wine and cheese making are few examples. Activities involving chemical reactions that have been around for thousands of years. Chemical reactions are abundant in a variety of complex processes occurring in the Earth's geology, atmosphere and oceans, and in all biological systems.
The balanced chemical equation is:
N2+3H2→2NH3
From stoichiometry,
2 mol of NH3
is produced from 3 mol of H2
8 mol of NH3 will be produced from = 3/2×8=12 mol of H2
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g the electron geometry of a molecule depends on the number of regions of electron density around the central atom in a molecule. if a molecule presents 3 regions around the central atom, which would be the predicted electron geometry?
The predicted electron geometry is a trigonal planar geometry.
What is electron geometry?Molecular geometry is the three-dimensional arrangement of atoms that make up a molecule. This includes not only the general shape of the molecule, but also bond lengths, bond angles, torsion angles, and all other geometric parameters that determine the position of each atom.The arrangement of electron groups is determined by the number of electron groups. On the other hand, the molecular shape depends not only on the number of electron groups, but also on the number of lone pairs. If the electron groups are all bond pairs, they are named exactly like the electron group geometry. The two regions of electron density around the central atom of the molecule form a rectilinear geometry. The three regions form a trigonal planar geometry. Four regions form a tetrahedral geometry. The five regions form a trigonal bipyramidal geometry. Six regions form an octahedral geometry.To know more about electron geometry visit:
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what is the relationship between the concentration of a solution and the amount of transmitted light through the solution?
Relationship between the concentration of a solution and the amount of transmitted light through the solution is directly proportional to the molar concentration of solution
Concentration is the amount solute that has been dissolved in a given amount of solvent or solution and the percentage of light by the colored solution can be detected and converted to absorbance of light and this is directly proportional and the absorbance is directly proportional to the concentration of the substances and the higher the concentration the higher its absorbance and this is because the proportion of light that get absorbed is affected by the number of molecule that it interact with it
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